Water is the most important natural resource and exists primarily in a liquid state on Earth. It can occur in three states: solid, liquid, and gas. Water undergoes continuous cycling between these states through various natural processes like evaporation, condensation, and precipitation in what is known as the water cycle. Only a small fraction of Earth's total water is readily accessible for human use.

1. Grade 06 Science
Unit 03An age of Smarters Cloud Nine Knowledge Hub

2. Water as a natural resource.
Water is the most important natural resource
we have. It is commonly found in liquid state.
The earth looks
blue because
is water.
Only 0.01% of this is consumable.

3. States of water
Water can occur in three states.

4. States of water
When heat energy is applied to ice cubes they turn
into liquid water. When further heated water turns
into vapour.
Solid Liquid Gas
Heat energy
Heat energy

5. Liquid states of water
River Lake Sea
Well Lagoon Reservoirs

6. Solid states of water
Ice GlaciersSnow
North Pole
South Pole
North
South

7. Gas states of water
Hot water GeysersBoiling Water
Steam engine train

8. Testing for water vapour in the
atmosphere.

9. Condensation: The conversion of vapour or gas to liquid form.
Evaporation: The conversion of liquids to gas form.
Precipitation: Water that comes out of the atmosphere. Its
form may change depending on the temperature.

10. The water cycle

11. What happens to water that falls on to earth?
Ground water
Water that seeps into the ground and are found in wells and springs.
Surface water
Water that stays on the surface of the snow. Found in lakes, rivers, oceans,
streams, ponds, tanks, and waterfalls.